package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * ClassName: RedisIdWork
 * Package:
 * Description:
 *
 * @Author pupu
 * @Create 2025/9/15 22:19
 * @Version 1.0
 */
@Component
public class RedisIdWork {

    public static final long BEGIN_TIMESTAMP =1640995200L;

    public static final int COUNT_BITS = 32;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWork(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //1. 生成时间戳 - 当前秒数
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2. 生成序列号 (获取当前日期)
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //自增长
        long count = stringRedisTemplate.opsForValue().increment("icr"+keyPrefix + ":" + date);

        //3. 拼接并返回
        return timestamp << COUNT_BITS | count ;
    }
}
